In order to study themechanical properties of Z-pins reinforced laminated composite single-lap adhesively bonded joint under un-directional static tensile load,damage failure analysis of the joint was carried out byme...In order to study themechanical properties of Z-pins reinforced laminated composite single-lap adhesively bonded joint under un-directional static tensile load,damage failure analysis of the joint was carried out bymeans of test and numerical simulation.The failure mode and mechanism of the joint were analyzed by tensile failure experiments.According to the experimental results,the joint exhibits mixed failure,and the ultimate failure is Z-pins pulling out of the adherend.In order to study the failure mechanism of the joint,the finite element method is used to predict the failure strength.The numerical results are in good agreement with the experimental results,and the error is 6.0%,which proves the validity of the numerical model.Through progressive damage failure analysis,it is found that matrix tensile failure of laminate at the edge of Z-pins occurs first,then adhesive layer failure-proceeds at the edge of Z-pins,and finally matrix-fiber shear failure of the laminate takes place.With the increase of load,the matrix-fiber shear failure expands gradually in the X direction,and at the same time,the matrix tensile failure at the hole edge gradually extends in different directions,which is consistent with the experimental results.展开更多
One dimensional Amosic-3 silicon carbide fiber reinforced silicon carbide matrix composites(SiCf/SiC minicomposites) prepared by chemical vapor infiltration were irradiated with 2.8 Me V proton ions. The ion fluences ...One dimensional Amosic-3 silicon carbide fiber reinforced silicon carbide matrix composites(SiCf/SiC minicomposites) prepared by chemical vapor infiltration were irradiated with 2.8 Me V proton ions. The ion fluences were 1.0 × 10^17 and 1.5 × 10^17cm^-2 at room temperature and 300℃, respectively. The microstructure and mechanical properties were investigated before and after proton irradiation. Raman spectra showed no evident change in Amosic-3 fibers regardless of irradiation temperature, which is confirmed by high resolution transmission electron microscopy observation. Pyrolytic carbon interphase showed slightly expansion after 300℃ irradiation, however, no microstructure changes were observed in SiC matrix. Moreover, it can be deduced that no irradiation induced changes in mechanical properties were observed after present proton irradiation.展开更多
基金supported by Natural Science Talents Program of Lingnan Normal University(No.ZL2021011).
文摘In order to study themechanical properties of Z-pins reinforced laminated composite single-lap adhesively bonded joint under un-directional static tensile load,damage failure analysis of the joint was carried out bymeans of test and numerical simulation.The failure mode and mechanism of the joint were analyzed by tensile failure experiments.According to the experimental results,the joint exhibits mixed failure,and the ultimate failure is Z-pins pulling out of the adherend.In order to study the failure mechanism of the joint,the finite element method is used to predict the failure strength.The numerical results are in good agreement with the experimental results,and the error is 6.0%,which proves the validity of the numerical model.Through progressive damage failure analysis,it is found that matrix tensile failure of laminate at the edge of Z-pins occurs first,then adhesive layer failure-proceeds at the edge of Z-pins,and finally matrix-fiber shear failure of the laminate takes place.With the increase of load,the matrix-fiber shear failure expands gradually in the X direction,and at the same time,the matrix tensile failure at the hole edge gradually extends in different directions,which is consistent with the experimental results.
基金supported by the National Natural Science Foundation of China (No.11575143)the Creative Research Foundation of Science and Technology on the Thermostructural Composite Material Laboratory (No.6142911030411)+1 种基金the Fundamental Research Funds for the Central Universities (No. 3102019TS0403)Science and Technology on Combustion, Internal Flow and Thermo-Structure Laboratory (No.6142701190302)
文摘One dimensional Amosic-3 silicon carbide fiber reinforced silicon carbide matrix composites(SiCf/SiC minicomposites) prepared by chemical vapor infiltration were irradiated with 2.8 Me V proton ions. The ion fluences were 1.0 × 10^17 and 1.5 × 10^17cm^-2 at room temperature and 300℃, respectively. The microstructure and mechanical properties were investigated before and after proton irradiation. Raman spectra showed no evident change in Amosic-3 fibers regardless of irradiation temperature, which is confirmed by high resolution transmission electron microscopy observation. Pyrolytic carbon interphase showed slightly expansion after 300℃ irradiation, however, no microstructure changes were observed in SiC matrix. Moreover, it can be deduced that no irradiation induced changes in mechanical properties were observed after present proton irradiation.
